Embryonal Carcinoma

**Semantic type:** Neoplastic Process

**Definition:** A non-seminomatous malignant germ cell tumor characterized by the presence of large germ cells with abundant cytoplasm resembling epithelial cells, geographic necrosis, high mitotic activity, and pseudoglandular and pseudopapillary structures formation. It can arise from the testis, ovary, and extragonadal sites (central nervous system and mediastinum).

**Synonyms:** - CARCINOMA, EMBRYONAL, MALIGNANT - Carcinoma, Embryonal, Malignant - Carcinosarcoma, embryonal - Embryonal carcinoma, NOS